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Single-seat single-engined high-wing monoplane with conventional three-axis control. Wing has unswept leading and trailing edges, and constant chord; T-tail. Pitch control by elevator on tail; yaw control by fin-mounted rudder; roll control by one-third-span ailerons; control inputs through stick for pitch/roll and pedals for yaw. Wing braced from below by struts; wing profile Wortmann FX 63-137; double-surface. Undercarriage has three wheels in tricycle formation with tailskid; no suspension on nosewheel and glass-fibre suspension on main wheels. Push-right go-right nosewheel steering connected to yaw control. Brakes on main wheels. Glassfibre fuselage, partially enclosed. Engine mounted at wing height driving pusher propeller. Wing and T-tail have wood spars, ribs in styrofoam and covered with expoxied glassfibre.

His first microlight made its first flights in 1978, the prototype AN-20 using a T-tail carried on a Kevlar spar of round section. Connected to the fuselage at the same height as the wing, the tubular fuselage carried basically a mono-wheel undercarriage but with an additional nosewheel steerable from the rudder bar, the main wheel being positioned directly below the wing. Moreover, the vertical fin below the fuselage spar was provided with a tailwheel in line with the other two.

This machine was shown in various publications under the designation of AN-20M, which was a great surprise to Albert Neukorn, who tells us that he had never called this first model by any other name than AN-20, except that it eventually became AN-20A to disting-uish it from the later AN-20B. The prototype was shown at the European homebuilders meeting at Brienne in July 1982.

The AN-20B is directly evolved from its predecessor whose rectangular plan form wing it has retained, supported by a profiled strut under each half wing. A significant change is the inclusion of air brakes, while the AN-20B is provided in addition with an elegant glass-fibre fairing with windscreen encompassing all the forward section of the fuselage as far as the trailing edge of the wing, where it joins the spar carrying the tail. Another important difference from the AN-20A is that this spar is no longer level with the wing but mid-mounted, a change which required a re-design of the T-tail. As a result, the fin and rudder no longer continue below the spar. The engine, previously fitted below the spar is now carried by a tubular structure above the rear spar, effectively level with the wing. Production models use the three cylinder Konig SC430 driving a three-bladed pusher propeller. Finally, a last important modification, the AN-20B replaced the single main wheel undercarriage of the AN-20A with a tricycle undercarriage whose main wheels are fitted with drum brakes.

The AN-20B was still produced by Albert Newkom himself in 1983, either ready-to-fly ex works without engine or as a set of plans. An attempt to set up production facility in France with the AN-20B in 1981 has been abandoned.